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5 Volt power supply for USB host port from li-ion accu

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thseiler

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usb accu

Hi

(I am new to this forum, got the address from a good friend...)

I need to add a USB 1.1 host port to an existing 3,3V microcontroller design.
(plan to use ISP1161 from philips as usb controller, it interfaces nicely to 3,3V)

My Problem: for the USB host port I need to supply 5 volts @ 500mA.
The existing design runs from a 3,65V, 1700mA/h Li-Ion accu.

Does anyone know of an IC that implements a high efficiency Charge Pump or Step-Up Converter to get 5V@500mA from a Li-Ion accu?

Best i have found so far is TPS60130 from TI, 5 volts@300mA with 85% efficiency.

Thank you very much
tom
 

max1811 step up

Hi

you have MAX1811 USB-Powered Li+ Charger.

best regards
Yodathegreat

thseiler said:
Hi

(I am new to this forum, got the address from a good friend...)

I need to add a USB 1.1 host port to an existing 3,3V microcontroller design.
(plan to use ISP1161 from philips as usb controller, it interfaces nicely to 3,3V)

My Problem: for the USB host port I need to supply 5 volts @ 500mA.
The existing design runs from a 3,65V, 1700mA/h Li-Ion accu.

Does anyone know of an IC that implements a high efficiency Charge Pump or Step-Up Converter to get 5V@500mA from a Li-Ion accu?

Best i have found so far is TPS60130 from TI, 5 volts@300mA with 85% efficiency.

Thank you very much
tom
Click to expand...
 

accu 5v

thseiler said:
My Problem: for the USB host port I need to supply 5 volts @ 500mA.
The existing design runs from a 3,65V, 1700mA/h Li-Ion accu.

Does anyone know of an IC that implements a high efficiency Charge Pump or Step-Up Converter to get 5V@500mA from a Li-Ion accu?

Best i have found so far is TPS60130 from TI, 5 volts@300mA with 85% efficiency.
Click to expand...
I did an online simulation using WEBENCH from National Semiconductor as follows:
**broken link removed**
From the simulation, National Semiconductor recommended several switching regulators that offer up to 93% of efficiency. Also, those switching regulators are capable of delivering 0.5A at 5V.

Hope it helps.
 

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